Carry trade

Many brokers held credits and debits interest on open positions. It could be calculated only on overnight positions or in real time.

Interests are calculated with the difference between interest rate of the two currencies you trade. For example if you trade Euro Dollar, the concerned central banks are ECB (European Central Bank) and FED (Federal Reserve). If the ECB's rate is 2.25% and FED's rate is 4.25% the difference is -2%. A long (buy) position on Euro Dollar will generate a 2% debit interest on your account, a short position will generate a credit interest of 2%.

The following calculator will give you the interest you'll pay or be paid with your trades. The interest is calculated with the duration and the size of your position.